<template>
    <div>
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-alert :closable="false"  title="添加商品信息" type="info" center show-icon></el-alert>
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
             <el-form :model="addGoodsForm" :rules="goodsRules" ref="addGoodsRef" class="demo-ruleForm">
            <el-tabs v-model="activeIndex" :before-leave="beforeTabsLeave" 
            :tab-position="'left'" @tab-click="tabClick">
                <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addGoodsForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="价格" prop="goods_price">
                            <el-input v-model="addGoodsForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="数量" prop="goods_number" type="number">
                            <el-input v-model="addGoodsForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="重量" prop="goods_weight" type="number">
                            <el-input v-model="addGoodsForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="">
                            <el-cascader
                                v-model="addGoodsForm.goods_cat"
                                :options="cateList"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                                     :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals" >
                                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                                     :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action到后台地址 -->
                        <el-upload
                            class="upload-demo"
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers='headersObj'
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addGoodsForm.goods_introduce">
                        </quill-editor>
                        <el-button style="margin:10px 0" @click="addGoods" type="primary">添加商品</el-button>
                    </el-tab-pane>
            </el-tabs>
            </el-form>
            <!-- 预览图片 -->
            <el-dialog
                title="图片预览"
                :visible.sync="previewVisiable"
                width="50%"
                >
                <img :src="previewPath" alt="" class="previewImg">
                
                </el-dialog>
                        </el-card>
    </div>
</template>
<script>
import _ from 'loadsh'
export default {
    data() {
        return{
            activeIndex:'0',
            cateList:[],
            addGoodsForm:{
                goods_name:'',
                goods_price:0,
                goods_number:0,
                goods_weight:0,
                goods_cat:[],
                pics:[],
                goods_introduce:'',
                attrs:[],
            },
            goodsRules:{
                goods_name:[
                     { required: true, message: '请输入商品名称', trigger: 'blur' },],
                goods_price:[
                     { required: true, message: '请输入商品价格', trigger: 'blur' },],
                goods_number:[
                     { required: true, message: '请输入商品数量', trigger: 'blur' },],
                goods_weight:[
                     { required: true, message: '请输入商品重量', trigger: 'blur' },],
                goods_cat:[
                     { required: true, message: '请选择商品分类', trigger: 'blur' },],
            },
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            manyTableData:[],
            onlyTableData:[],
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            headersObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisiable:false,
            

        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res} = await this.$http.get('categories',{params:this.queryInfo})
            if(res.meta.status !== 200) return this.$message.error('获取商品分类列表失败')
            this.cateList = res.data
        },
        // 级联选择器选中的事件
        handleChange(){
            if(this.addGoodsForm.goods_cat.length !== 3){
                this.addGoodsForm.goods_cat = []
            }
        },
        // 尽行下一步之前
        beforeTabsLeave(activeName,oldActiveName){
            if(oldActiveName === '0' && this.addGoodsForm.goods_cat.length !==3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        // 点击tab导航时触发的事件
        async tabClick(){
            if(this.activeIndex === '1'){
               const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(res.meta.status !== 200) return this.$message.error('获取列表失败')
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals.length === 0 ? [] :
                                        item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
                console.log(res.data);
            }else if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status !== 200) return this.$message.error('获取列表失败')
                
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisiable = true
        },
        // 处理图片移除效果
        handleRemove(file){
            // 获取要删除的图片
            const fileInfo = file.response.data.tmp_path
            // 获取图片的索引值
            const i = this.addGoodsForm.pics.findIndex(x => x.pic===fileInfo)
            // 删除数组中对应的数据
            this.addGoodsForm.pics.splice(i,1)
            console.log(this.addGoodsForm);
        },
        handleSuccess(response){
            const picInfo = {pic:response.data.tmp_path}
            this.addGoodsForm.pics.push(picInfo)
            console.log(this.addGoodsForm   );
            
        },
        addGoods(){
            this.$refs.addGoodsRef.validate(async valid => {
                if(!valid) return this.$message.error('请填写必要的表单项')
                // 执行添加逻辑
                const form = _.cloneDeep(this.addGoodsForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id:item.attr_id,
                        attr_vals:item.attr_vals.join(' ')
                    }
                    this.addGoodsForm.attrs.push(newInfo)
                })
                 // 处理静态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id:item.attr_id,
                        attr_vals:item.attr_vals
                    }
                    this.addGoodsForm.attrs.push(newInfo)
                })
                form.attrs = this.addGoodsForm.attrs
                // 发起请求
                // 商品名称是唯一的
                const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201) return this.$message.error('添加商品失败')
                this.$message.success('添加商品成功')
                this.getCateList()
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        // 当前选中的三级分类    
        cateId(){
            if(this.addGoodsForm.goods_cat.length === 3){
                return this.addGoodsForm.goods_cat[2]
            }return null
        },
        
    }
}
</script>
<style lang="less" scoped>
.el-steps{
    margin: 20px 0;
}
.el-step__title{
    font-size: 13px;
}
.el-checkbox{
    margin:0 10px 0 0 !important
}
.previewImg{
    width: 100%;
}
</style>